The PipeTrenchMultipleLayers2 subassembly has a single pipe in a trench, a layer of material encasing the pipe, and an additional layer of material above the pipe encasement.
This subassembly allows volume calculation of bedding base, pipe zone, and granular backfill. The pipe is encased in a layer of material right above the bedding. The center of pipe is the design profile. The depth of topmost layer of the trench will vary; the other pipe trench layers are constant depths. All of the depths, widths and diameters will change from trench to trench. The depth of the trench will vary along the alignment since it is measure from the bottom of the trench to the target surface.
Attachment
By default, the attachment point is the center of the pipe.
Input Parameters
|
Parameter |
Description |
Type |
Default |
|---|---|---|---|
| Bottom Width | Specifies width of the pipe trench. | Numeric, positive |
3 ft 1 m |
| Pipe Cover | Cover of the pipe. | Numeric, positive |
0.5 ft 0.15 m |
| Pipe Diameter | Pipe diameter. | Numeric, positive |
0.667 ft 0.2 m |
| Bedding Depth | Depth of the pipe bedding under the pipe invert. | Numeric, positive |
0.75 ft 0.2 m |
| Pipe Encasement Material Depth | Depth of pipe bedding over the pipe invert. | Numeric, positive |
1.5 ft 0.45 m |
| Surface Slope | X : 1 slope of the trench side slopes. | Numeric, positive |
1 (: 1) |
| Top Material Depth | Depth of the bedding over the pipe bedding. | Numeric, positive |
3 ft 1 m |
Target Parameters
This section lists the parameters in this subassembly that can be mapped to one or more target objects. For more information, see To Specify Corridor Targets.
|
Parameter |
Description |
Status |
|---|---|---|
| Daylight Surface | Name of the daylighting surface. The following object types can be used as targets for specifying the surface: surfaces. | Required |
Runtime Logical Assignments
None.
Output Parameters
None.
Behavior
The elevation of the bottom of the trench is calculated as the profile grade line elevation minus half the pipe diameter plus the bedding depth. The horizontal trench bottom link is placed symmetrically about the attachment point offset at that elevation. The pipe encasement material depth is used to provide for material around the pipe. Above the pipe encasement material is Material2 to provide material above the pipe. The side slopes are extended upward to the existing surface. The horizontal bedding link is placed at the given depth above the trench bottom.
Layout Mode Operation
In layout mode, this subassembly draws a trench.
Point, Link, and Shape Codes
The following table lists the point, link, and shape codes for this subassembly that have codes assigned to them. Point, link, or shape codes for this subassembly that do not have codes assigned are not included in this table.
|
Point, Link, or Shape |
Code |
Description |
|---|---|---|
| P1 | PipeBottom | Bottom of pipe |
| P2 | Datum, BeddingBottomCenter | Center of bedding bottom |
| P3 | PipeBackfillBottom_In | Inside pipe backfill bottom |
| P4 | PipeBeddingBottom_In | Inside pipe bedding bottom |
| P6 | Datum, PipeBeddingBottom_Out | Outside pipe bedding bottom |
| P7 | PipeBackfillBottom_Out | Outside pipe backfill bottom |
| P11, P13 | Pipe | |
| P12 | PipeTop | Top of pipe |
| P14 | PipeCenter | Center of pipe |
| P15 | BottomMaterial2_In | Inside Material2 bottom |
| P16 | BottomMaterial2_Out | Outside Material2 bottom |
| P17 | BottomMaterial1_In | Inside Material 1 bottom |
| P18 | BottomMaterial1_Out | Outside Material1 bottom |
| P19 | Top, TrenchInner | Inner trench |
| P20 | Top, TrenchOuter | Outer trench |
| L1 | PipeBackfillBottom | Pipe backfill bottom |
| L2, L4 | PipeBedding | Pipe bedding |
| L3 | Datum, PipeBeddingBottom | Bottom of bedding |
| L5 | PipeBackfillBottom | Bottom of backfill |
| L6 - L7 | Pipe | |
| L8 | PipeBackfillMaterial_In | Inside pipe backfill material |
| L9 | PipeBackfillMaterial_Out | Outside pipe backfill material |
| L10 | BottomMaterial2 | Bottom of Material2 |
| L11 | TrenchMaterial2_In | Inside trench Material2 |
| L12 | TrenchMaterial2_Out | Outside trench Material2 |
| L13 | BottomMaterial1 | Bottom of Material1 |
| L14 | TrenchSlopeMaterial1_In | Inside trench slope Material1 |
| L15 | TrenchSlopeMaterial2_Out | Outside trench slope Material1 |
| L16 | Top, TrenchWidth | Trench width |
| S1 | PipeBedding | Pipe bedding |
| S2 | PipeBackfillMaterial | Pipe backfill material |
| S3 | TrenchMaterial2 | Trench Material2 |
| S4 | TrenchMaterial1 | Trench Material1 |
Coding Diagram
